CVE-2026-83760 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in Microsoft Bluetooth Driver allows an authorized attacker to disclose information locally.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as an out-of-bounds read within the Microsoft Bluetooth driver represents a critical memory safety flaw that compromises the integrity of system resources by allowing unauthorized access to sensitive data structures. This specific defect occurs when the driver fails to properly validate input parameters or buffer boundaries before performing memory read operations, leading to the retrieval of information from adjacent memory locations outside the intended allocation. Such errors are typically classified under CWE-125, which defines out-of-bounds read vulnerabilities where software reads past the end of a buffer. In the context of kernel-mode drivers like those managing Bluetooth hardware interfaces, these flaws can expose internal state variables, cryptographic keys, or other privileged data that should remain isolated from user-space applications.
From an operational perspective, this vulnerability enables a local attacker with valid authentication credentials to exploit the flaw and disclose system information without escalating privileges beyond their existing account level. The impact is primarily informational disclosure rather than direct code execution or denial of service in its initial manifestation. However, leaked memory contents can serve as valuable intelligence for further attacks, such as bypassing security mitigations like Address Space Layout Randomization by leaking kernel base addresses. This aligns with the ATT&CK technique T1082, which involves system information discovery through operating system properties and configuration details obtained via local access. The attacker leverages the driver's excessive trust in input data to trigger the read operation, effectively turning a routine Bluetooth stack interaction into an information leak channel.
The root cause often stems from insufficient boundary checks during packet parsing or buffer management routines within the driver codebase. When processing incoming Bluetooth frames or managing connection states, the software may calculate offsets based on untrusted values without verifying that these offsets remain within the allocated memory region. This lack of rigorous validation allows an attacker to craft specific malformed inputs that cause the driver to read from unintended memory addresses. The severity is heightened by the fact that kernel drivers operate with high privileges, meaning any information disclosed can potentially aid in constructing more sophisticated exploits targeting other components of the operating system.
Mitigation strategies for this vulnerability primarily involve applying vendor-provided security patches that correct the buffer boundary validation logic within the affected driver versions. Administrators should ensure that all systems are updated to the latest stable release containing these fixes, as manual workarounds are rarely effective for kernel-level memory safety issues. Additionally, enforcing strict least-privilege principles can limit the potential impact by ensuring that only essential services have access to Bluetooth-related interfaces. Monitoring system logs for unusual driver behavior or unexpected memory accesses may also provide early detection indicators, although such events might not always be explicitly logged depending on the specific implementation details of the vulnerability and the operating system's auditing capabilities.